Model Series 640 & 650

Tiller Assembly Components

This section presents an exploded view of the main tiller assembly, showing the arrangement of components such as the handle, frame, tine shields, and bolo tines.

Ref.	Part Number	Description
1	686-04077A	Tine Shield Assembly
1	686-04076A	Tine Shield Assembly
2	710-0597	Hex Head Screw, 1/4-20 x 1.00
3	710-0604A	Screw, 5/16-18 x 0.625
4	710-1238	Hex Head Washer, 5/16-18 x .875
5	710-3008	Hex Head Screw, 5/16-18 x .75
6	712-04063	Flangelock Nut, 5/16-18
7	712-04064	Flangelock Nut, 1/4-20
8	712-04065	Flangelock Nut, 3/8-16
9	715-0108	Spring Pin, 1/4 DIA x 1.00 LG
10	732-04320	Torsion Spring
11	738-04320	Screw, Shoulder, 5/16-18 x .405 x .435
12	938-0533	Screw, Shoulder, $r .498 x 1.635
13	750-05349	Spacer, Split, .350 x.268 x .375
14	786-04092	Stop Reverse Arm
15	786-04098	Support Channel Bracket
16	786-04104	Depth Drag Bar
17	786-04292A	Depth Adjuster Bar
18	786-04363	LH Tail Bracket
19	786-04364	RH Tail Bracket
20	649-04097	Upper Handle Assembly
21*	686-04135	Reverse Handle Assembly
22	710-0599	Screw, 1/4-20 x 0.500
23	710-0805	Hex Head Screw, 5/16-18 x 1.50
24*	731-04735	Reverse Handle Grip
25*	710-3288	Hex Head Screw, 1/4-20 x 1.62
26*	936-0176	Flat Washer, .265 x .938 x .120
27	946-04413	Forward Cable
28*	946-04414	Reverse Cable
29	747-04789	Clutch Bail
30	749-04742	Lower Handle
31	786-04433	Support Handle Bracket
32	786-04200	Handle Panel
33	742-04226	LH Bolo Tine
34	742-04227	RH Bolo Tine
35	710-0347	Hex Head Screw, 3/8-16 x 1.75
36	731-06170	Belt Cover
37	736-0173	Washer, Flat,.28 x .74 x .063
38*	710-04605	Screw, 5/16-18 x 1.50
39*	686-04134	Bumper
40	912-3000	Nut, Hexlock, 3/8-16
41	710-0514	Hex Head Screw, 3/8-16 x 1.00
42*	686-04065	Tine Holder Assembly
42	686-04066	Tine Holder Assembly
43	710-05211	Carriage Bolt, 5/16-18 x 6.75
44	720-04072A	Knob, 5/16-18
45	936-0170	Washer, .326 x .875 x .145
46*	936-0451	Washer, Saddle, .320 x .93 x .060
47	738-0440	Spacer, .375 x .165
48	786-04434	Support Handle Bracket
49	720-04163	Handle Grip
50	720-04173	Reverse Handle Grip
51	720-05023	Handle Grip
52	710-0896	Self Tapping Screw, 1/4-14 x .625
	* 650 Series

Drive Train and Wheel Assembly Components

This diagram illustrates the drive train and wheel assembly, including wheels, axles, pulleys, and belts.

Ref.	Part Number	Description
1	684-04168	Idler Pulley Assembly, 1.917 OD
2	710-0170	Hex Head Screw, 5/16-24 x .625
3	710-0151	Hex Head Screw, 3/8-24 x 2.00
4	710-0502A	Screw, 3/8-16 x 1.250
5	710-0599	Screw, 1/4-20 x 0.500
6	710-0606	Hex Head Screw, 1/4-20 x 1.50
7	710-0672	Hex Head Screw, 5/16-24 x 1.25
8	710-0805	Hex Head Screw, 5/16-18 x 1.50, B&S
9	710-1880	Hex Head Screw, 5/16-18 x .75, Patch
10	736-0315	Washer, Flat, .760 x 1.50 x .120
11	712-04063	Flangelock Nut, 5/16-18, B&S
12	712-04064	Flangelock Nut, 1/4-20
13	712-0700	Flange Nut, 9/16-18
14	718-04407	Pulley Hub, 5/8 SPLINE
15	732-04085	Extension Spring, .480 OD x 5.00 LG
16	732-04276A	Extension Spring, LT5 PTO
17	936-0119	Washer, Lock, 5/16
18	736-0173	Washer, Flat, .28 x .74 x .063
19	736-0343	Washer, Flat, .330 x 1.25 x .120
20	736-04193	Washer, .396 x 1.140 x .095, B&S
21	936-0452	Washer, Bell, .396 x 1.140 x .095
22	736-3092	Washer, Flat, .265 x 1.0 x .030
23	753-06042A	Transmission Assembly
24	738-04425	Screw, Shoulder, 1/4-28 x .342 x .335
25	748-04087A	Forward Idler Pivot Spacer
26	750-04571	Spacer, Shoulder, .260 x .785 x .538
27	750-04907	Reverse Idler Pivot Spacer
28	954-04090	V Belt, 4L x 25.375 LG
29	954-04091	V Belt, 3L x 29.125 LG
30	756-04198A	Engine Pulley, 3L & 4L, Honda
31	756-04355	Transmission Pulley
32	756-0625	Cable Roller
33	786-04312	Forward Idler Bracket
34	786-04343	Cover Mounting Plate
35	786-04346	Reverse Idler Bracket
36	786-04357	Pulley Mounting Bracket
37	786-04419B	LH Mount Frame
38	786-04418B	RH Mount Frame
39	786-04371	Pulley Shield
40	934-04232	Wheel, 13 x 5 x 6
*	934-04453	Wheel Assembly, 11 x 4-4
41	714-0143A	Klik Pin, .25 DIA x 1.56
42	721-04271	Oil Plug
43	710-0896	Self Tapping Screw, 1/4-14 x .625
*	640 Series

Transmission and Drive Axle Components

This diagram details the transmission and drive axle components, featuring gears, bearings, seals, and mounting brackets.

Ref.	Part Number	Description
1	919-04202B	Transmission Housing
2	710-3008	Hex Head Screw, 5/16-18 x .75
3	911-04844	Tiller Shaft
4	911-04854	Wheel Shaft
5	711-05035	CRT Drive Shaft
6	714-04059	Key, .25 x 1.062
7	716-0204	Retainer Ring
8	716-04102	Retainer Ring
9	917-04380	RH Gear Worm, 61T
10	917-04381	LH Gear Worm, 30T
11	918-04435	Bearing Cover
12	921-04030	Oil Seal, .750 SHF x 1.783 BORE
13	941-04298	Cone Bearing
14	921-04229	Gear Housing Gasket
15	721-04232	Oil Seal, 1.00 SHF x 2.00 BORE
16	721-04271	Rubber Oil Plug
17	736-04305	Washer, Flat, 1.50 x 1.75 x .062
18	736-04306	Washer, Flat, 1.50 x 1.75 x .005
19	736-04307	Washer, Flat, 1.50 x 1.75 x .03
20	736-04308	Washer, Flat, 1.50 x 1.75 x .010
21	736-0745	Washer, Flat, 1.010 x 1.56 x .060
22	941-04299	Cup Bearing
23	786-04366	Tiller Transmission Cover
24	786-04392	Tiller Transmission Cover
25	741-3114	Ball Bearing, 1 x 52 x 15 x 6205-1

170-AU Engine Components

Air Cleaner

Diagram of the 170-AU Air Cleaner assembly.

Ref.	Part Number	Description
35	951-14315	Air Cleaner Housing
36	712-04213	Nut
37	951-14068	Self-Tapping Bolt4.2×16
38	951-14069	Carbon Canister
40	951-14070	Silencer Plate
41	750-05314	Bushing
42	951-14262	Air Filter
43	951-12136	Air Cleaner Cover
45	951-14073	Piping Hose
46	951-14074	Exhaust Piping

Carburetor

Diagram of the 170-AU Carburetor assembly and its components.

Ref.	Part Number	Description
29	710-05101	Carburetor Stud Bolt M6×110
30	951-11567	Carburetor Insulator Gasket
31	951-11568	Carburetor Insulator
32	951-11569A	Carburetor Gasket
33	951-05021	Carburetor Assembly
34	951-11571	Carburetor Gasket Plate
130	951-05034	Carburetor Repair Kit
a	951-11177	Control Lever, Choke
b	n/a	Choke Shaft
c	n/a	Choke Plate
d	n/a	Throttle Shaft
e	n/a	Throttle Plate
f	n/a	Fuel Shutoff Lever Screw M3×6
g	736-04638	Lock Washer
h	n/a	Idle Jet Assembly
i	n/a	Gasket, Throttle Plate
j	n/a	Idle Speed Adjusting Screw
k	n/a	Mixture Screw
l	n/a	Carburetor Body
m	n/a	Float Pin
n	n/a	Emulsion Tube
o	951-12875	Float Needle Valve
p	n/a	Main Jet
q	n/a	Needle Valve Spring
r	n/a	Float
s	951-11589	Fuel Bowl Gasket
t	n/a	Fuel Bowl
u	951-11348	Fuel Bowl Gasket
v	710-04945	Fuel Bowl Mounting Bolt
w	951-11349	Fuel Drain Plug Gasket
x	710-04938	Fuel Drain Plug

Crankcase

Diagram of the 170-AU Crankcase assembly and associated parts.

Ref.	Part Number	Description
53	951-14317	Piston Ring Set
54	951-11632	Piston Pin Snap Ring
55	951-14318	Piston
56	951-11633	Piston Pin
57	710-04915	Bolt M6×12
58	951-11113	Air Shield
59	951-11573	Connecting Rod Assembly
60	951-14053	Governor Shaft
61	736-04461	Washer - 5.2 X 1.9
62	951-11902	Governor Seal
63	714-04078	Cotter Pin
64	951-11575	Camshaft Assembly
65	951-11369	Radial Ball Bearing, 6205
66	751-14143	Crankshaft Service Kit
67	951-10307	Woodruff Key
68	951-11576	Governor Gear/Shaft Assembly
69	715-04092	Dowel Pin 7x14
70	715-04096	Dowel Pin 9x14
71	951-11371	Crankcase Cover Gasket
72	951-12125	Crankcase Cover
	751-14142	Crankcase Cover Service Kit
73	710-04932	Bolt M8x32
75	951-11577	O-Ring 15.8 X 2.5
76	951-12394	Oil Plug
77	951-11578	Oil Seal, 25x41.25×6
78	751-14144	Crankcase Service Kit
	951-05031	Shortblock Assembly
79	951-12514	Oil Drain Plug
82	951-12126	Oil Seal
127	952Z170-AU	Complete Engine
128	951-12026A	Gasket Kit - External
129	951-05032	Gasket Kit - Complete

Fuel Tank & Mounting

Diagram of the 170-AU Fuel Tank and mounting hardware.

Ref.	Part Number	Description
1	710-04968	Bolt M6×16
57	710-04915	Bolt M6×12
94	951-11067	Throttle Control Knob
95	951-12131	Primer Bracket
96	710-05103	Bolt M6×12
97	951-11585	Governor Spring
98	951-10664	Throttle Linkage Spring
99	951-10665	Governor Rod
101	951-11106	Governor Arm Bracket
102	712-04212	Nut M6
103	710-04908	Governor Arm Bolt
104	751-10650	Fuel Line Kit
105	951-11700	Fuel Hose Clamp
106	951-14075	Valve, Roller Over
107	951-11914	Engine Dipstick Cover
108	710-04905	Bolt
109	951-11913	Oil Fill Tube Assembly
110	951-11904	Dipstick O-Ring
111	951-10656	Dipstick Tube
112	951-11381	O-Ring
113	951-12482	Dipstick Assembly
114	951-12535	Fuel Cap
115	951-14076	Fuel Cap Chain
116	951-14133	Primer Hose Assembly
120	951-11933	Fuel Level Indicator
121	951-10651	Fuel Tank Nipple
122	951-14332	Fuel Tank
123	712-05015	Nut M6

Flywheel & Blower Housing

Diagram of the 170-AU Flywheel and Blower Housing assembly.

Ref.	Part Number	Description
57	710-04915	Bolt M6×12
80	951-11110	Air Flow Shield
81	710-04940	Bolt M6×10
83	951-10792	Ignition Coil
84	710-04919	Flange Bolt M6X25
85	951-14320	Flywheel
86	951-10934	Cooling Fan
87	951-10911	Starter Cup
88	712-04209	Flywheel Nut, M14 X 1.5
90	951-11583	Blower Housing
91	736-04455	Flat Washer
92	710-04974	Bolt M6×10
93	951-12418	Recoil Starter Assembly
124	710-04918	Bolt:Flange M6X20
125	951-14138	Blower Housing Shield

Cylinder Head

Diagram of the 170-AU Cylinder Head assembly and its components.

Ref.	Part Number	Description
1	710-04968	Bolt M6×16
2	951-11054B	Valve Cover
4	731-07059	Breather Hose
5	726-04101	Breather Hose Clamp
6	951-11565	Valve Cover Gasket
7	951-11892	Rocker Arm Assembly
8	751-11124	Nut, Pivot Locking
9	751-11123	Adjusting Nut, Valve
10	951-11893	Rocker Arm
11	710-04902	Bolt, Pivot
12	951-11895	Push Rod Guide
13	951-12000	Valve Spring Retainer (Intake)
14	951-12002	Exhaust Valve Adjuster
15	951-12003	Valve Spring Retainer (Exhaust)
16	951-12004	Valve Spring
17	951-11894	Valve Seal (Intake)
18	710-06080	Bolt M8×55
19	951-05029	Cylinder Head Assembly
20	951-10292	Spark Plug/F6Rtc
47	951-14316	Gasket, Cylinder Head
48	751-10648	Push Rod Kit
49	951-11899	Tappet
50	715-04108	Dowel Pin 10X16
51	751-10647A	Valve Kit
52	751-10647A	Valve Kit
126	951-05033	Valve Cover Kit
127	952Z170-AU	Complete Engine
128	951-12026A	Gasket Kit - External
129	951-05032	Gasket Kit - Complete

Muffler

Diagram of the 170-AU Muffler assembly.

Ref.	Part Number	Description
21	710-04911	Muffler Stud M8×34
21	751-10657	Muffle Stud Kit
22	951-11289	Exhaust Pipe Gasket
24	951-14267	Muffler Body
25	751-14311	Muffler Shield
26	951-14310	Muffler Guard
27	710-06073	Bolt M5×8
28	712-04214	Nut, M8

170-TU Engine Components

Air Cleaner

Diagram of the 170-TU Air Cleaner assembly.

Ref.	Part Number	Description
32	951-10806	Air Cleaner Housing
33	712-04213	Nut
34	951-14068	Self-Tapping Bolt M4.2×16
35	951-14069	Carbon Canister
37	951-14070	Silencer Plate
38	750-05314	Rubber Shock Pad
39	951-10794	Air Filter Assembly
40	951-14071	Air Filter Cover
41	951-14072	Primer Hose
42	951-14073	Clamp
43	951-14074	Exhaust Piping

Carburetor

Diagram of the 170-TU Carburetor assembly and its components.

Ref.	Part Number	Description
26	710-05101	Stud M6×110
27	951-11567	Carburetor Insulator Gasket
28	951-11568	Carburetor Insulator
29	951-11569A	Carburetor Gasket
30	951-12124	Carburetor Assembly
31	951-11571	Carburetor Gasket Plate
127	951-12119A	Carburetor Kit - Major
a	951-11177	Control Lever, Choke
b	n/a	Choke Shaft
c	n/a	Choke Plate
d	n/a	Throttle Shaft
e	n/a	Throttle Plate
f	n/a	Screw M3×5
g	736-04638	Lock Washer
h	n/a	Idle Jet Assembly
i	n/a	Gasket, Throttle Plate
j	n/a	Idle Speed Adjusting Screw
k	n/a	Mixture Screw
l	n/a	Carburetor Body
m	n/a	Float Pin
n	n/a	Emulsion Tube
o	951-12875	Float Needle Valve
p	n/a	Main Jet
q	n/a	Needle Valve Spring
r	n/a	Float
s	951-11589	Fuel Bowl Gasket
t	n/a	Fuel Bowl
u	951-11348	Fuel Bowl Gasket
v	710-04945	Fuel Bowl Mounting Bolt
w	951-11349	Fuel Drain Plug Gasket
x	710-04938	Fuel Drain Plug

Crankshaft & Crankcase

Diagram of the 170-TU Crankshaft and Crankcase assembly.

Ref.	Part Number	Description
50	951-12111	Piston Ring Set
51	951-11632	Piston Pin Snap Ring
52	951-12007	Piston
53	951-11633	Piston Pin
54	710-04915	Bolt M6×12
55	951-11113	Air Shield
56	951-11573	Connecting Rod Assembly
57	951-11356	Governor Arm Shaft
58	736-04461	Washer 5.2×1.9
59	951-11574	Governor Seal
60	714-04074	Cotter Pin
61	951-11575	Camshaft Assy.
62	951-11369	Radial Ball Bearing, 6205
63	951-12160	Crankshaft Assembly
64	951-10307	Woodruff Key
65	951-11576	Governor Gear/Shaft Assembly
66	715-04092	Dowel Pin 7x14
67	715-04089	Dowel Pin 9x14
68	951-11371	Crankcase Cover Gasket
69	951-12125	Cover Comp, Left Crankcase
70	710-04932	Bolt M8x32
71	951-11283	Oil Plug
72	951-11578	Oil Seal, 25x41.25×6
73	951-12551	Short Block
74	951-12514	Oil Drain Plug
77	951-12126	Oil Seal 25x41.25×6
125	951-12573	Gasket Kit - External
126	951-12572	Gasket Kit - Complete
130	952Z170-TU	Complete Engine

Fuel Tank & Mounting

Diagram of the 170-TU Fuel Tank and mounting hardware.

Ref.	Part Number	Description
1	710-04968	Bolt M6×16
3	726-04101	Breather Hose Clamp
90	951-11067	Throttle Control Knob
91	951-12131	Primer Bracket
92	710-05103	Bolt M6×12
93	951-11585	Governor Spring
94	951-10664	Throttle Linkage Spring
95	951-10665	Throttle Linkage
97	951-11106	Governor Arm
98	712-04212	Nut M6
99	710-04908	Governor Arm Bolt
100	951-10650	Fuel Line Kit
101	951-11700	Fuel Hose Clamp
102	710-04915	Bolt M6×12
103	951-14075	Rollover Valve
104	951-11914	Dipstick Decoration Cover
105	710-04905	Bolt
106	710-04915	Bolt M6×12
107	951-12482	Dipstick Assembly
108	951-11381	O-Ring
109	951-11913	Oil Fill Tube Assembly
110	951-11904	O-Ring
111	951-11912	Dipstick Guage
112	951-12535	Cap Comp, Fuel
113	951-14076	Tether
114	751-14139	Primer Hose
118	951-14077	Fuel Tank Assembly
119	951-11933	Fuel Level Indicator
120	951-10651	Fuel Tank Nipple
121	712-04212	Nut, M6

Flywheel & Blower Housing

Diagram of the 170-TU Flywheel and Blower Housing assembly.

Ref.	Part Number	Description
75	951-11110	Air Flow Shield
76	710-04940	Bolt M6×10
78	951-10792	Ignition Coil Assembly
79	710-04919	Bolt M6×25
80	951-10805	Flywheel
81	951-10934	Fan, Cooling
82	951-10911	Pulley, Starter
83	712-04209	Nut, Special, M14×1.5
84	710-04915	Bolt M6×12
86	951-11583	Blower Housing
87	736-04455	Washer
88	710-04974	Bolt M6×10
89	951-12418	Recoil Starter
122	710-04918	Bolt M6×20
123	951-11109	Blower Housing Shield

Cylinder Head

Diagram of the 170-TU Cylinder Head assembly and its components.

Ref.	Part Number	Description
1	710-04968	Bolt M6×16
2	951-11054	Valve Cover
3	726-04101	Breather Hose Clamp
4	731-07059	Exhaust Piping
6	951-11565	Valve Cover Gasket
7	951-11892	Rocker Arm Assembly
8	751-11124	Nut, Pivot Locking
9	751-11123	Adjusting Nut, Valve
10	951-11893	Rocker Arm
11	710-04902	Bolt, Pivot
12	951-11895	Push Rod Guide
13	951-12000	Retainer, In.Valve Spring
14	951-12002	Adjuster, Exh Valve
15	951-12003	Retainer, Ex.Valve Spring
16	951-12004	Valve Spring
17	951-11894	Intake Valve Seal
18	710-04933	Bolt M8×55
19	951-10819	Cylinder Head Service Kit
20	951-10292	Spark Plug/F6Rtc
44	951-11572	Gasket, Cylinder Head
45	951-10648	Push Rod Kit
46	951-11899	Tappet
47	715-04108	Dowel Pin 10x16
48	951-10647A	Valve Kit
49	951-10647A	Valve Kit
124	951-11063А	Valve Cover Kit
125	951-12573	Gasket Kit - External
126	951-12572	Gasket Kit - Complete
130	952Z170-TU	Complete Engine

Muffler

Diagram of the 170-TU Muffler assembly.

Ref.	Part Number	Description
21	951-14063	Stud M8×38
22	951-11289	Exhaust Pipe Gasket
23	712-04214	Nut, M8
24	951-14067	Muffler Assembly
25	951-12865	Secondary Air Valve

	MTD RS5LCK 5 HP Counter-Rotating Rear-Tine Tiller Parts List and Diagrams Comprehensive parts list and diagrams for the MTD RS5LCK 5 HP Counter-Rotating Rear-Tine Tiller, detailing components for the main assembly and tine drive transmission. Includes part numbers and descriptions for maintenance and repair.
	MTD 5 HP Chain Drive Tiller 3039B (811-4548) Parts List and Diagram Detailed parts list and exploded view diagram for the MTD 5 HP Chain Drive Tiller, model 3039B (811-4548). Includes part numbers and descriptions for easy identification and ordering of replacement parts.
	MTD WTR5AL 5 HP Counter-Rotating Rear-Tine Tiller Parts Manual Official MTD parts manual and lookup guide for the WTR5AL model, a 5 HP counter-rotating rear-tine tiller. Find diagrams and replacement parts for MTD lawn mowers, snowblowers, tractors, and trimmers.
	MTD A3150K Tiller Parts Diagram and List Detailed parts list and diagram description for the MTD A3150K 3 H.P. chain-drive front tine tiller, including part numbers, descriptions, and important service notes.
	MTD 450 Series Rear Tine Tiller Illustrated Parts Manual Comprehensive illustrated parts manual for the MTD 450 Series Rear Tine Tiller, detailing components for the handle, tine shield, drive system, transmission, and 170-V0A engine. Includes part numbers and descriptions for all serviceable components.
	MTD 53GT 5Hp Chain Drive Tiller Parts Diagram and List Detailed parts diagram and comprehensive parts list for the MTD 53GT 5Hp Chain Drive Tiller, including component identification for maintenance and repair.
	3 HP Chain Drive Tiller Parts List and Diagram Comprehensive parts list and exploded view diagram for the MTD 3 HP Chain Drive Tiller (Models 23-3150D, C2-3150D, 44-02416D), detailing each component with part numbers and descriptions for maintenance and repair.
	MTD 5 HP Chain Drive Tiller 23-5350D Parts List and Diagram Detailed parts list and exploded view diagram for the MTD 5 HP Chain Drive Tiller, model 23-5350D. Find part numbers and descriptions for all components.

Model Series 640 & 650

Tiller Assembly Components

Drive Train and Wheel Assembly Components

Transmission and Drive Axle Components

170-AU Engine Components

Air Cleaner

Carburetor

Crankcase

Fuel Tank & Mounting

Flywheel & Blower Housing

Cylinder Head

Muffler

170-TU Engine Components

Air Cleaner

Carburetor

Crankshaft & Crankcase

Fuel Tank & Mounting

Flywheel & Blower Housing

Cylinder Head

Muffler

Related Documents